A concurrent reader of the store's destination file (another process
opening it, an indexer, an antivirus scan) makes MoveFileExW fail with a
sharing or access error for as long as it holds the handle. That is
transient by construction; treating the first refusal as the outcome
killed Muninn serve on 2026-09-11 the moment a status CLI overlapped a
write. The replace retries such errors for up to half a second. The test
holds the destination open from another thread and expects the replace to
outlast it.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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